LXR linux/arch/mips/lib/iomap-pci.c

   1/*
   2 * Implement the default iomap interfaces
   3 *
   4 * (C) Copyright 2004 Linus Torvalds
   5 * (C) Copyright 2006 Ralf Baechle <ralf@linux-mips.org>
   6 * (C) Copyright 2007 MIPS Technologies, Inc.
   7 *     written by Ralf Baechle <ralf@linux-mips.org>
   8 */
   9#include <linux/pci.h>
  10#include <linux/module.h>
  11#include <asm/io.h>
  12
  13static void __iomem *ioport_map_pci(struct pci_dev *dev,
  14                                     unsigned long port, unsigned int nr)
  15{
  16        struct pci_controller *ctrl = dev->bus->sysdata;
  17        unsigned long base = ctrl->io_map_base;
  18
  19        /* This will eventually become a BUG_ON but for now be gentle */
  20        if (unlikely(!ctrl->io_map_base)) {
  21                struct pci_bus *bus = dev->bus;
  22                char name[8];
  23
  24                while (bus->parent)
  25                        bus = bus->parent;
  26
  27                ctrl->io_map_base = base = mips_io_port_base;
  28
  29                sprintf(name, "%04x:%02x", pci_domain_nr(bus), bus->number);
  30                printk(KERN_WARNING "io_map_base of root PCI bus %s unset.  "
  31                       "Trying to continue but you better\nfix this issue or "
  32                       "report it to linux-mips@linux-mips.org or your "
  33                       "vendor.\n", name);
  34#ifdef CONFIG_PCI_DOMAINS
  35                panic("To avoid data corruption io_map_base MUST be set with "
  36                      "multiple PCI domains.");
  37#endif
  38        }
  39
  40        return (void __iomem *) (ctrl->io_map_base + port);
  41}
  42
  43/*
  44 * Create a virtual mapping cookie for a PCI BAR (memory or IO)
  45 */
  46void __iomem *pci_iomap(struct pci_dev *dev, int bar, unsigned long maxlen)
  47{
  48        resource_size_t start = pci_resource_start(dev, bar);
  49        resource_size_t len = pci_resource_len(dev, bar);
  50        unsigned long flags = pci_resource_flags(dev, bar);
  51
  52        if (!len || !start)
  53                return NULL;
  54        if (maxlen && len > maxlen)
  55                len = maxlen;
  56        if (flags & IORESOURCE_IO)
  57                return ioport_map_pci(dev, start, len);
  58        if (flags & IORESOURCE_MEM) {
  59                if (flags & IORESOURCE_CACHEABLE)
  60                        return ioremap(start, len);
  61                return ioremap_nocache(start, len);
  62        }
  63        /* What? */
  64        return NULL;
  65}
  66
  67EXPORT_SYMBOL(pci_iomap);
  68
  69void pci_iounmap(struct pci_dev *dev, void __iomem * addr)
  70{
  71        iounmap(addr);
  72}
  73
  74EXPORT_SYMBOL(pci_iounmap);
  75